Question

Identify the correct statement with regard to G1 phase (Gap I) of the interphase?

• A. Cell is metabolically active, grows but does not replicate its DNA
• B. Nuclear division takes place
• C. DNA synthesis or replication takes place
• D. Reorganisation of all cell components takes place

Answer 1

The correct option is A

Cell is metabolically active, grows but does not replicate its DNA

The correct option is A:

Explanation of the correct option:

1. The cell cycle is a series of events that occur in a cell that result in DNA duplication and cytoplasm and organelle division, resulting in the formation of two daughter cells.
2. The cell cycle is divided into four stages:
   1. G1 Phase
   2. S Phase
   3. G2 Phase
   4. M Phase
3. G1 Phase:
   • The G1 phase is the time period between mitosis and the start of DNA replication.
   • The cell is metabolically active and expands continually during the G1 phase, but it does not duplicate its DNA.

Explanation of the incorrect option:

Option B:

1. The nuclear division takes place during the M-phase.
2. M phase has 4 stages:
   1. Prophase
   2. Metaphase
   3. Anaphase
   4. Telophase

Option C:

1. DNA synthesis or replication takes place during the S phase of the cell cycle.
2. The amount of DNA per cell doubles throughout this time. If the starting amount of DNA is 2C, it will increase to 4C. However, the chromosome number does not grow; if the cell had diploid or 2n chromosomes at G1, the number of chromosomes remains the same after S phase, i.e. 2n.

Option D:

1. Reorganisation of all cell components takes place during the telophase of the M Phase.

Final answer: Cell is metabolically active, grows but does not replicate its DNA is the correct statement.